Capacity Check — Rubber-Tyred Gantry (RTG)
Gross-load vs chart utilization for a rubber-tyred gantry (rtg), with rigging weight and dynamic allowance included.
Container gantries rate by spreader load (40–50 t) with eccentricity limits rather than radius. The utilization that matters is per-corner: a 40 t box with CG a metre off-centre overloads one corner long before the total trips an alarm. Pair this check with the CG tools in this category.
Formula
Note: Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
Gross-load vs chart utilization for a rubber-tyred gantry (rtg), with rigging weight and dynamic allowance included. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Capacity Check — Rubber-Tyred Gantry (RTG)
Capacity Check — Rubber-Tyred Gantry (RTG) computes the governing relationship gross = (net + rigging) × (1 + dynamic%) vs chart at radius live as you type. Container gantries rate by spreader load (40–50 t) with eccentricity limits rather than radius. The utilization that matters is per-corner: a 40 t box with CG a metre off-centre overloads one corner long before the total trips an alarm. Pair this check with the CG tools in this category. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Capacity Check — Rubber-Tyred Gantry (RTG)
- 1Enter your values — Net load, Rigging + block weight, Chart capacity at this radius/config, Dynamic allowance (sensible defaults are pre-filled).
- 2Read the live results: Gross design load, Chart utilization, Remaining margin.
- 3Check the "with your numbers" line to see gross = (net + rigging) × (1 + dynamic%) vs chart at radius substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Capacity Check — Rubber-Tyred Gantry (RTG)?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula gross = (net + rigging) × (1 + dynamic%) vs chart at radius with authoritative sources cited on the page (ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices; OSHA 29 CFR 1926 Subpart CC — Cranes & derricks in construction)
- ✓Container gantries rate by spreader load (40–50 t) with eccentricity limits rather than radius.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the capacity check — rubber-tyred gantry (rtg) use?+
It evaluates gross = (net + rigging) × (1 + dynamic%) vs chart at radius, exactly as published. Sources: ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices; OSHA 29 CFR 1926 Subpart CC — Cranes & derricks in construction. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Container gantries rate by spreader load (40–50 t) with eccentricity limits rather than radius. Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
When is this calculator the right tool for the job?+
Gross-load vs chart utilization for a rubber-tyred gantry (rtg), with rigging weight and dynamic allowance included. A free crane load, wind & rigging safety tool. The utilization that matters is per-corner: a 40 t box with CG a metre off-centre overloads one corner long before the total trips an alarm. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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